package com.sky.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.sky.entity.OrderDetail;
import com.sky.entity.Orders;
import com.sky.entity.User;
import com.sky.mapper.user.OrderDetailMapper;
import com.sky.mapper.user.OrderMapper;
import com.sky.mapper.user.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.apache.commons.lang.StringUtils;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额数据统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        ArrayList<LocalDate> dateList = new ArrayList<>();
        // 日期计算
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("status", Orders.COMPLETED);
            map.put("begin", beginTime);
            map.put("end", endTime);
            QueryWrapper<Orders> wrapper = new QueryWrapper<>();
            wrapper.select("sum(amount) total")
                    .lambda()
                    .eq(Orders::getStatus, Orders.COMPLETED)
                    .ge(Orders::getOrderTime, beginTime)
                    .le(Orders::getOrderTime, endTime);
            Map<String, Object> result = orderMapper.selectMaps(wrapper).get(0);
            Double turnover = (Double) result.get("total");
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        //数据封装
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();

    }

    /**
     * 用户数据统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        // 统计日期
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        ArrayList<Integer> newUserList = new ArrayList<>();
        ArrayList<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // 统计新增用户
            Integer newUser = getUserCount(beginTime, endTime);
            // 统计用户总数
            Integer sumUser = getUserCount(null, endTime);
            newUserList.add(newUser);
            totalUserList.add(sumUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();

    }

    /**
     * 根据时间区间统计用户数量
     *
     * @param beginTime
     * @param endTime
     * @return
     */
    private Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
        return  Math.toIntExact(userMapper.selectCount(new LambdaQueryWrapper<User>()
                .ge(beginTime != null, User::getCreateTime, beginTime)
                .le(endTime != null, User::getCreateTime, endTime)));
    }

    /**
     * 订单统计
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        // 统计日期
        List<LocalDate> dateList = new ArrayList<>();
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        // 每日有效订单数
        ArrayList<String> validOrderCountList = new ArrayList<>();
        // 每日总订单数
        ArrayList<String> orderCountList = new ArrayList<>();
        // 每日订单完成率

        // 订单总数
        int totalOrderCount = 0;
        // 有效订单总数
        int vaildOrderCount = 0;

        for (LocalDate date : dateList) {
            // select count(*) from orders where status = ? and order_time ? between ?;
            // 查询每日有效订单
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            LambdaQueryWrapper<Orders> wrapper = new LambdaQueryWrapper<>();
            wrapper.ge(Orders::getOrderTime, beginTime)
                    .le(Orders::getOrderTime, endTime);
            Long totalOrderPreDayOrder = orderMapper.selectCount(wrapper);

            // 查询每日总订单
            wrapper.eq(Orders::getStatus, Orders.COMPLETED);
            Long vaildOrderPreDay = orderMapper.selectCount(wrapper);

            validOrderCountList.add(String.valueOf(vaildOrderPreDay));
            orderCountList.add(String.valueOf(totalOrderPreDayOrder));
            totalOrderCount += totalOrderPreDayOrder;
            vaildOrderCount += vaildOrderPreDay;
        }

        // 订单完成率
        Double orderCompletionRate = totalOrderCount == 0 ? 0.0 : (1.0 * vaildOrderCount / totalOrderCount);

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(vaildOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量排名Top10
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        // select name, count(*) from order_detail where order_id in (?,?) group by name order by count(*) desc limit ?;
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        // 查询在日期范围内的订单
        LambdaQueryWrapper<Orders> wrapper = new LambdaQueryWrapper<>();
        wrapper.gt(Orders::getOrderTime, beginTime)
                .le(Orders::getOrderTime, endTime)
                .eq(Orders::getStatus, Orders.COMPLETED);

        List<Orders> ordersList = orderMapper.selectList(wrapper);

        List<Long> orderIds = ordersList.stream()
                .map(orders -> orders.getId())
                .collect(Collectors.toList());
        // 根据订单id查询排名前num的商品名字和销售量
        QueryWrapper<OrderDetail> wrapperDetail = new QueryWrapper<>();
        wrapperDetail.select("name, count(*) count")
                .in("order_id", orderIds)
                .groupBy("name")
                .orderByDesc("count")
                .last("limit 10");

        List<Map<String, Object>> mapList = orderDetailMapper.selectMaps(wrapperDetail);
        // 商品名称

        // 商品名称列表
        List<String> nameList = new ArrayList<>();
        // 销量列表
        List<String> numberList = new ArrayList<>();

        for (Map<String, Object> map : mapList) {
            String name = (String) map.get("name");
            String count = String.valueOf(map.get("count"));
            nameList.add(name);
            numberList.add(count);
        }


        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(nameList, ","))
                .numberList(StringUtils.join(numberList, ","))
                .build();

    }

    /**
     * 导出近30天的运营数据报表
     *
     * @param response
     **/
    public void exportBusinessData(HttpServletResponse response) {
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);
        //查询概览运营数据，提供给Excel模板文件
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin, LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于提供好的模板文件创建一个新的Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);
            //获得Excel文件中的一个Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            sheet.getRow(1).getCell(1).setCellValue(begin + "至" + end);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            //获取单元格
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                //准备明细数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //通过输出流将文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.flush();
            out.close();
            excel.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
